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pulsating system

a friend of mine had a leaky backflow device so i replaced the valve undder the bell housing. it seemed fine,we adjusted all the heads andwent home. the next day it started pulsating getting louder as the zones advanced and it squirts out the top of the backflow device each time it pulsates. so we replaced the whole backflow device and it still does it. was this simaler to your experience? we are stumped.